South Korea, U.S. respond to North Korean nuclear threat
Updated: 2014-03-31 06:32:43 KST

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North Korea has threatened to carry out a "new form" of nuclear test in response to a UN condemnation of the regime's recent ballistic missile launches.
Responding to the latest provocative move, Seoul's foreign ministry spokesperson said Sunday that if the North were to carry out a fourth nuclear test, it would "pay" for its actions.
The U.S. State Department labeled the latest threat a troubling and provocative escalation.
Let's hear what the North Korean state news agency said in the first place to trigger such a strong response.